171253216525 has 6 divisors (see below), whose sum is σ = 212353988522. Its totient is φ = 137002573200.

The previous prime is 171253216513. The next prime is 171253216559. The reversal of 171253216525 is 525612352171.

It can be written as a sum of positive squares in 3 ways, for example, as 10140087204 + 161113129321 = 100698^2 + 401389^2 .

It is not a de Polignac number, because 171253216525 - 2⁵ = 171253216493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3425064306 + ... + 3425064355.

Almost surely, 2^171253216525 is an apocalyptic number.

It is an amenable number.

171253216525 is a deficient number, since it is larger than the sum of its proper divisors (41100771997).

171253216525 is an equidigital number, since it uses as much as digits as its factorization.

171253216525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6850128671 (or 6850128666 counting only the distinct ones).

The product of its digits is 126000, while the sum is 40.

Adding to 171253216525 its reverse (525612352171), we get a palindrome (696865568696).

The spelling of 171253216525 in words is "one hundred seventy-one billion, two hundred fifty-three million, two hundred sixteen thousand, five hundred twenty-five".